is it too late to install it now? or did it get done automatically without specifying it?

if it's NOT getting installed, can i just do an apt-get at this late stage (server fully up and running) or will i need to do more configuration (presumably postfix needs be told to talk to it somehow, maybe the rest of the ispconfig system too?)

alternatively - am i on totally the wrong track, can i just add a line to postfix configuration. It's been a while since i had to do any of this and my head is a little rusty

If i remember correctly from my old ISPCONFIG2 server - this is SASL's job?

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ISPConfig 2 and 3 use a totally different mail setup. In the setup you used to install ISPCOnfig 3, smtp authentication is handled by dovecot and not sasl, so sasl must and may not be installed.

If you have a problem with smtp authentication, then please post the exact error messages from the mail log file. A common error for users that used ispconfig 2 before is that they use a wrong username for email. In ISPConfig 3, the email username is the fulle email address and not just the part in front of the @ sign.

Did you try to send to a internal or external domain name? SMTP auth is only required on a mailserver when you send a email to a domain that is not on the local server (e.g. to gmail). Email to local domains never need smtp auth (thats the case on ispconfig 2 and 3 and any other mailserver) as it would be impossible to send a email to alocal domain if it would require auth for that. Another option where smtp auth is not used is inside local networks that are defined in mynetworks in postfix main.cf file.

Please post the line as it appears in the log and replace just the IP with e.g. 192.168.0.1 biut dont replace the username part, the way you replaced things in the error line makes it impossible to determine if you setup the mail client correctly

this server is going to replace an old ispconfig2 server - so in order to minimise disruption to clients i've manually enabled the login's for each account with the 'Allow custom login name' option

each user has the old-style web[x]_[username] style of login.

i've replaced the external ip address with : 99.99.99.99 - becuase there ARE some connections showing there from local networking (192.168 range addresses) and i wanted it to be clear which are external POP-retrieval connections.

i should probably add that the server was built yesterday - there have been no configuration changes or updates on the system other than those i've already mentioned. So everything installed should be most recent available.

It's a fresh install from the 'perfect server' guide for debian squeeze.

All i've altered from that guide is the usual ip address/username/password parts, checked the 'allow custom login' box, and added my domains and users.